source: vendor/glibc-tests/glibc/resolv/ga_test.c

#include <arpa/inet.h>
#include <netinet/in.h>
#include <netdb.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>


int
main (void)
{
#define N 10
  struct gaicb reqmem[N];
  struct gaicb *req[N];
  int n;

  for (n = 0; n < N; ++n)
    {
      asprintf (&reqmem[n].ar_name, "test%d.test.redhat.com", 140 + n);
      reqmem[n].ar_service = NULL;
      reqmem[n].ar_request = NULL;
      reqmem[n].ar_result = NULL;
      req[n] = &reqmem[n];
    }

  if (getaddrinfo_a (GAI_NOWAIT, req, N, NULL) != 0)
    {
      puts ("queue call failed");
      exit (1);
    }
  else
    puts ("queue call successful");

  while (1)
    {
      int any = 0;

      for (n = 0; n < N; ++n)
        if (req[n] != NULL && gai_error (req[n]) != EAI_INPROGRESS)
          {
            if (gai_error (req[n]) == 0)
              {
                struct addrinfo *runp = req[n]->ar_result;

                while (runp != NULL)
                  {
                    switch (runp->ai_family)
                      {
                      case PF_INET:
                        {
                          struct sockaddr_in *sinp;

                          sinp = (struct sockaddr_in *) runp->ai_addr;
                          printf ("%2d: %s = %s\n", n,
                                  req[n]->ar_name, inet_ntoa (sinp->sin_addr));
                        }
                        break;
                      default:
                        printf ("%2d: family %d\n", n, runp->ai_family);
                        break;
                      }
                    runp = runp->ai_next;
                  }
              }
            else
              printf ("error for %d: %s\n", n,
                      gai_strerror (gai_error (req[n])));
            req[n] = NULL;
            break;
          }
        else if (req[n] != NULL)
          any = 1;

      if (n == N)
        {
          if (any)
            gai_suspend (req, N, NULL);
          else
            break;
        }
    }

  __libc_write(1,"got all\n", 8);

  for (n = 0; n < N; ++n)
    if (gai_error (&reqmem[n]) == 0)
      {
        struct addrinfo *runp = reqmem[n].ar_result;

        while (runp != NULL)
          {
            struct addrinfo *oldp = runp;
            runp = runp->ai_next;
            freeaddrinfo (oldp);
          }
      }

  return 0;
}